Update docs, add test, alias ignore->ignoredPaths

[msutkowski]

Fixes #491

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[msutkowski]

@markerikson When we inlined this middleware, I just moved the tests over as they were and didn't update anything outside of the types. I propose changing this test:

  it('Should not print a warning if "next" takes too long', () => {
    const next: Dispatch = action => {
      const started = Date.now()
      while (Date.now() - started < 8) {}
      return action
    }

    const dispatch = middleware({ warnAfter: 4 })(next)

    const restore = mockConsole(createConsole())
    try {
      dispatch({ type: 'SOME_ACTION' })
      expect(getLog().log).toEqual('')
    } finally {
      restore()
    }
  })
})

to this:

  it('Should not print a warning if execution completes before the warnAfter threshold', () => {
    const next: Dispatch = action => action

    const dispatch = middleware({ warnAfter: 32 })(next) 

    const restore = mockConsole(createConsole())
    try {
      dispatch({ type: 'SOME_ACTION' })
      expect(getLog().log).toEqual('')
    } finally {
      restore()
    }
  })
})

[markerikson]

The point of that test is to make sure we're only measuring the time the middleware itself takes to execute. If a reducer takes a long time, that's not something we want to warn about. Also, that's a test we specifically added while working on 1.3.0, when we added the warnAfter option (which isn't part of the original immutable middleware package).

So, leave that test as-is.